Open Channel Hydraulics is designed as a comprehensive textbook for undergraduate and postgraduate Civil Engineering students, offering a clear understanding of fundamental and advanced concepts. Organized into nine systematically arranged chapters, the book explains complex topics in simple language with the support of relevant figures and tables. It is equally useful for candidates preparing for GATE, ESE, PSU, and State-Level Service Commission examinations. The book includes over 200 solved numerical problems, 275 objective questions, 326 short-answer questions, 115 practice problems, and fully solved GATE and ESE questions from 1995 to 2024. Each chapter concludes with a concise summary of key concepts.